Who is legally allowed to install a septic tank with a low-pressure dosing drain field at a rental house?

The correct answer is Installer II. This designation refers to professionals who have received specialized training and certification that qualifies them to install more complex septic systems, including those with low-pressure dosing drain fields. The nature of these systems requires expertise in both hydraulic and environmental engineering principles to ensure they function correctly and comply with local regulations.

Installer II specialists are trained to manage the installation's intricacies, including ensuring proper site evaluation, system design, and compliance with health and safety standards. This level of expertise is essential, particularly since low-pressure dosing systems may involve specific operational and maintenance considerations that are not typically within the purview of less specialized installers or professionals in other fields, such as plumbing or engineering.

Other options represent individuals who either lack the specific qualifications or focus required for this particular installation task. A certified plumber, for example, is skilled in plumbing systems but may not possess the specialized training for septic systems. Similarly, while a registered engineer has broad qualifications, they do not necessarily have the specific certifications related to septic system installation. Installer I typically has a lesser level of certification and experience compared to Installer II, thereby lacking the expertise needed for more complex installations.